Update 8/16/16: The Windows 10 Anniversary Update has begun rolling out for Windows 10 Mobile. The Anniversary Update includes additional features and improvements for your Windows 10 phone. To manually check for the update, on Start, swipe over to the All apps list, then select Settings > Update & security > Phone update > Check for updates. Note that availability may vary by manufacturer, model, country or region, mobile operator or service provider, hardware limitations and other factors.
Read more at https://blogs.windows.com/windowsexperience/2016/08/02/how-to-get-the-windows-10-anniversary-update/#281y4Y5OcC3cTiut.99